论文标题
钒催化剂对NaBH4氢进化的影响
Effect of vanadium catalysts on hydrogen evolution from NaBH4
论文作者
论文摘要
NABH4是一种非常便宜且富含氢的材料，也是一种潜在的氢存储。但是，其热分解的高温（高于530°C）使其在实际使用方面无法实现。在这里，我们研究了添加含有催化剂对热氢脱附的各种V的影响。事实证明，用钒金属，其氧化物或纳米颗粒的机械化学掺杂显着降低了热解的温度。值得注意的是，NaBH4铣削了3小时，其中V2O5或VO2释放的25 wt。从Ca的温度范围内，有70％的氢储存。 370°C至450°C。另一方面，用于在Ortho difluorobenzen中悬浮在THF或更小的均匀和较大的液化和更大的液化和更大的钒纳米颗粒（约4nm）中，用于制备相当均匀的钒纳米颗粒（约4nm），对氢化进化的纯度具有不利影响。
NaBH4 is a very cheap and hydrogen rich material and a potential hydrogen store. However, high temperature of its thermal decomposition (above 530°C) renders it inapplicable in practical use. Here, we have studied the effect of addition of diverse V containing catalysts on thermal hydrogen desorption. It turns out that mechanochemical doping of NaBH4 with vanadium metal, its oxides or nanoparticles lowers the temperature of pyrolysis significantly. Notably, NaBH4 milled for 3 hrs with 25 wt.% of V2O5 or VO2 releases ca. 70 % of stored hydrogen in the temperature range from ca. 370°C to 450°C. On the other hand, precursors and solvents used to prepare rather uniform vanadium nanoparticles (ca. 4nm) suspended in THF or less uniform and larger ones (ca. 28nm) in ortho difluorobenzene, have adverse effect on purity of hydrogen evolved.
